BRUNSWICK, Ga. -- Five months after a Georgia toddler was killed in his stroller by a gunshot to the head, a teenager charged as the gunman is scheduled to stand trial.

Jury selection is scheduled to begin Monday in the murder trial of De'Marquise Elkins. He's charged with killing 13-month-old Antonio Santiago in Brunswick on March 21.

Police say 18-year-old Elkins opened fire during an attempted robbery after the child's mother refused to give him cash. A 15-year-old boy charged as an accomplice, Dominique Lang, told police Elkins fired the gun and is expected to be a key witness.

Elkins' defense attorneys have suggested in pretrial motions that the toddler was killed by his parents.